Pertaining to the utilization of the waste heat of gas-engines.



C. SEII/IMLER.

PERTAINING TO THE UTILIZATION OF THE WASTE HEAT 0F GAS ENGINES.

APPLICATION FILED .IAN.24. N4.

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cam. SEMMLER,

T FFTCEO 0F WIESBADEN, GER-MAN Y.

PERTAINING TO THE UTILIZATION OF THE WASTE HEAT 0F GAS-ENGINES.

menace.

Specification of Letters Patent.

Patented June as, 1191 a.

Application filed January 24, 1914. Serial No. 814,053.

To all whom it may concern:

Be it known that CARL SEMMLER, a subject of the King of Prussia, residing at 20 Mainzerstrasse, Wiesbaden, in the German Empire, has invented certain new and useful Improvements in or Pertaining to the -l Utilization of the Waste Heat of Gas-Engines, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to a method of and apparatus for the utilization of the waste heat of combustion cially of gas engines.

It has already been haust gases while at th their waste heat, by arranging within the proposed to cool exeen found practicable by this means to cool theexhaust gases to an extent suficient to prevent theignition of the inflammable event of repeated misfiring, find their way into the exhaust silencer or outlet pipe and cause damage by explosion therein after the entry of the exhaust gases due to a subsequent charge.

It has also been proposed to arrange steam generators in the exhaust outlet but this plan has not proved satisfactory in practice, as the operation of the steam generators has very soon become seriously impaired by the formationof heat-insulating.

deposits.

N ow the present invention jects, first to cool the and to such a low temperature as to render impossible the subsequent ignition of any 1nfiammable gaseous mixture which may find its way into the exhaust outlet in consequence of non-firing, and secondly so to con struct the exhaust outlet as to render its destruction impossible even in the event of an explosion. The certainty that the operation of the apparatus cannot be arrested through the destructive effect of an explosion enables the cooling of the gas engine cylinders to be combined with the cooling of the exhaust, a safe and uniform method of cooling being thus obtained While the certainty of continuous operation is still further increased by the fact that, as the coolin medium circulates without loss in a close circuit, it may consist of distilled water, so as to prevent the formation of heat-insulatmotors and more espeing deposits on the cooling or heating sur faces.

The accompanying drawings illustrate by way of example one form of apparatus for carrying out the invention; in

is a diagrammatic representation of the apparatus and Fig. 2 is a detail view of a portion thereof.

ferring now to the drawings: The cylinders a of the gas engine, are surrounded by cooling jackets 72. Th from the .engine cylinders means of an exhaust pipe 0, which should be as short as possible, to a tubular boiler (Z. Around the exhaust pipe 0 there is arranged a jacketing pipe 0 connected with the j ackets b and the water space of the boiler d'by junction pipes 0 al The cooling medium circulates in the space between the tubes 0' and c and preferably, as shown in Fig. 2, there is arranged in this space one or more *helically Wound rods 6 by'means of which, while the tubes are structurally reinforced, the water circuit is at the same time longed, and the water compelled to travel at uniform speed in a prescribed course, instead of being stopped at corners and thus giving rise to development of steam and are conveyed by consequently to surface-heating.

The exhaust gases, as already stated, pass from the exhaust pipe 0 to the tubular boiler by means of which the taking up of waste heat is mainly efl'ected. To enable this to be done, the exhaust outlet 0 is expanded at It to the same diameter as the boiler (Z. The considerable increase of cross sectional area to which this gives rise results in a corre sponding decrease of the rate of flow of the exhaust gases, and consequently, in a more efi'ectual exchange of heat between the hot gases and the cooling water. In order to insure thatthe diminution of the speed of the gases due to the widening of the path through which they flow shall not result 1n the production of uncooled rangement adopted is that known as a tubular boiler, that is to say, the gases flow through the tubes and thence to the exhaust outlet 7 while the cooling medium circulates around the tubes.

It is particularly important not only for the utilization of the waste heat and for preventing the risk of the bursting of the cylin-, ders, but also for efl'ecting the intensive cooling of the gases in the exhaust pipe 0 and which Figure e exhaust gases pro- I cycle, and means for forcing said medium to follow a predethe tubular boiler 12 that the cooling medium should be prevented from developing steam. For this purpose, there is inserted in the circuit of the cooling medium, a pump or like liquid propelling device 9 and a throttling device it whereby so high a pressure is maintained in the circuit as to prevent the formationof steam.

The heat taken up by the cooling medium is or may be utilized in a heat exchanging device such as a coil Z.

What I claim is 1. In anapparatus for the utilization of waste heat, a gas engine, an exhaust-pipe, a jacket surrounding said exhaust pipe and adapted to contain a heat-absorbing medium, means for feeding said medium in a cycle and through said exhaust pipe-jacket, and a throttling device in said cycle adapted to check the expansion into steam of said medium infront of the throttling device, and permit such expansion back of said device.

2. In an apparatus for the utilization of waste heat, a gas engine an exhaust pipe, a jacket surrounding said exhaust pipe and adapted to contain a heat-absorbing medium, means for feeding said medium in a cycle and through said exhaust pipe-jacket, a

throttling device, a propelling device and an intervening heat exchangin device inv said located within said jacket termined course while flowing through the jacket.

3. In an apparatus for the utilization of waste heat, a gas engine, an exhaust pipe, a a Jacket surrounding said exhaust pipe and adapted to contain a heat-absorbing medium, means 'for feeding said medium through said exhaust pipe-jacket, a throttling device adapted to check the flow of said medium, and a helically wound rod located within said jacket for forcing said medium to follow a spiral course while flowing through the jacket.

4. In an apparatus for the utilization of waste heat, a gas engine provided with a jacket that surrounds theengine cylinder, an exhaust pipe, a jacket surrounding said exhaust pipe, both of said jackets being adapted tocontain a heat-absorbing medium, means for co secutively feeding said medium through sa1d jackets and a throttling device adapted to check the flow of said medium.

5. In apparatus for the utilization of Waste heat, a gas engine, the combination with cylinder jacketingmeans, of exhaust pipe jacketing means comprising a pipe surrounding the exhaust pipe and a helically wound rod interposed between said exhaust and jacketing pipes, and of a closed pipe circuit connecting said jacketing means with a heat utilizing device, a pumping device adapted to circulate through said circuit a liquid suitable for absorbing heat, and a pressure regulating device adapted to maintain in said circuit, a pressure suiiiciently high to prevent said liquid from becoming vaporized therein.-

In testimony whereof I have hereunto affixed my signature in presence of two witnesses.

CARL SEMMLER.

' Witnesses:

WOLDEMAR HAUPT, HENRY HASPER. 

